Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f0d7c1beff09c5…

MALICIOUS

PDF

86.8 KB Created: 2021-08-16 19:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c625343a71e7561d59ba462f508b86b6 SHA-1: 10bfc58b541d67849eb0d5c96a2bd8ba8749026e SHA-256: 90f0d7c1beff09c5a9c665cdde810cb076b605f33a341c42a2595e25605166d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as phishing/trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites, suggesting an attempt to obscure malicious intent or leverage existing infrastructure. The presence of numerous unknown URLs and a high ML score indicates a strong likelihood of malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b091e4920f1---vaxofuxiwinodenexizobar.pdf In PDF document text
    • http://marleenjansen.nl/images/uploadfiles/fuvawi.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/gavokoriv.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/voduxazu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/78663374700.pdfIn PDF document text
    • http://allasclub.com/campannas/file/57732033212.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7e18e496bc0039a6415b144d417f8f27/buzem.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/poropoferetekenokabej.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/12340217593.pdfIn PDF document text
    • http://medrea.ru/upload/files/76861114506.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d9376f1bbff---vukow.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/10657572959.pdfIn PDF document text
    • http://alvitraders.com/files/38154984519.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wosururadeguga.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bsvdpr92akcvf69jpbg6r58s03/15982961912.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608690f1cecbb---95203124496.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/dalefegudikenikos.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/xitax.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160794ec44fbb3---devuvodu.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/87851133426.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/58189365840.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/setabum.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/bokugejudorukijamudozuj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94d11eea83---71120415492.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42abff793eaa7f3644fcf195c73119cb/42455023832.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a0ehj7s9re00efoodvk4860k10/86365150779.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/a2e04109f7118deee3c2c4e17dfde305/62553071661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=examen+de+admision+unmsm+2020+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 10840 bytes
SHA-256: 45aeecef731730937458078189c490e6ce15ebc65da46b5bf8630986cec21556
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 18320 bytes
SHA-256: 6d0e63f89fbee8275a9441363d2bc4fa24d9f6cedcf217c302b5d61abbc26130
font_02_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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